I'm happily using my new X-Arcade Tankstick with MAMEUI64 and can move up and down the list of games but can't find a button on the X-Arcade that launches the highlighted game.
So I want to map one of the existing key on the X-Arcade to launch the highlighted game.
Player1 button seems a good choice but I can't find that right file to amend with KEYCODE_1. I've added it to numerous places but no joy :-(